Don't register cookie access on empty cookie list.

chrome/browser/tab_contents/tab_specific_content_settings.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/tab_contents/tab_specific_content_settings.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browsing_data_appcache_helper.h"
 #include "chrome/browser/browsing_data_database_helper.h"
 #include "chrome/browser/browsing_data_indexed_db_helper.h"
@@ skipping 89 matching lines @@
     content_accessed_[type] = true;
     if (delegate_)
       delegate_->OnContentSettingsAccessed(false);
   }
 }
 
 void TabSpecificContentSettings::OnCookiesRead(
     const GURL& url,
     const net::CookieList& cookie_list,
     bool blocked_by_policy) {
+  if (cookie_list.empty())
+    return;
   LocalSharedObjectsContainer& container = blocked_by_policy ?
       blocked_local_shared_objects_ : allowed_local_shared_objects_;
   typedef net::CookieList::const_iterator cookie_iterator;
   for (cookie_iterator cookie = cookie_list.begin();
        cookie != cookie_list.end(); ++cookie) {
     container.cookies()->SetCookieWithDetails(url,
                                               cookie->Name(),
                                               cookie->Value(),
                                               cookie->Domain(),
                                               cookie->Path(),
@@ skipping 177 matching lines @@
 
 CookiesTreeModel*
 TabSpecificContentSettings::LocalSharedObjectsContainer::GetCookiesTreeModel() {
   return new CookiesTreeModel(cookies_,
                               databases_,
                               local_storages_,
                               session_storages_,
                               appcaches_,
                               indexed_dbs_);
 }